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Ankylosaur diversity

There were three types of ankylosaurs – the nodosaurids, ankylosaurids and polacanthids. They differed slightly in a number of features including shape of the skull, structure of the tail, and amount and structure of body spines and armour.

Examples of ankylosaurs include:

Sauropelta edwardsorum – nodosaurid, USA, 115–112 million years ago

Euoplocephalus tutus – ankylosaurid, North America, 76–68 million years ago

Gargoyleosaurus parkpini – polacanthid, North America, 156–146 million years ago